18680307 has 4 divisors (see below), whose sum is σ = 24907080. Its totient is φ = 12453536.

The previous prime is 18680273. The next prime is 18680317. The reversal of 18680307 is 70308681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70308681 = 3 ⋅23436227.

It is a cyclic number.

It is not a de Polignac number, because 18680307 - 2⁶ = 18680243 is a prime.

It is a super-2 number, since 2×18680307² = 697907739228498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18680317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3113382 + ... + 3113387.

It is an arithmetic number, because the mean of its divisors is an integer number (6226770).

Almost surely, 2^18680307 is an apocalyptic number.

18680307 is a deficient number, since it is larger than the sum of its proper divisors (6226773).

18680307 is an equidigital number, since it uses as much as digits as its factorization.

18680307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226772.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18680307 is about 4322.0720725134. The cubic root of 18680307 is about 265.3350786832.

Adding to 18680307 its reverse (70308681), we get a palindrome (88988988).

The spelling of 18680307 in words is "eighteen million, six hundred eighty thousand, three hundred seven".